<property name="componentpartId" type="long" not-null="true" column="p_componentpart_id"/> <set name="b" lazy="true" cascade="none" fetch="join"> <key column="p_componentpart_id" property-ref="componentpartId" /> <one-to-many class="B" /> </set> B <many-to-one name="a" class="A" column="p_componentpart_id" property-ref="componentpartId" cascade="none" ....../>
